Abstract
Abstract Autoradiographs of histologic sections from excised corn ( Zea mays ) roots exposed to 35 S labeled SO 4 2‐ after pretreatment with K + , Ca 2+ , or Al 3+ are shown. The autoradiographs indicate that the permeability of the epidermal layer to sulfate is severely restricted when pretreated with K + but not when pretreated with Ca 2+ or Al 3+ . Apparently this effect is associated with the cation exchange sites located in or near the epidermal layer and results from the electrostatic repulsive forces opposing anions which approach the epidermis, where the negatively charged sites are first encountered. The repulsive force would be an inverse function of the degree neutralization of the exchange sites by adsorbed cations which is in the order Al 3+ > Ca 2+ > K + .
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Claims 4
Claim · model-written summary
Pretreatment with K+ severely restricted sulfate permeability of the epidermal layer in excised corn roots.
- Taxon
- corn
Zea mays subsp. mayse2 - Organ / stage
- epidermal layere1
- Treatment
- pretreated with K +e1
- Outcome
- permeability of the epidermal layer to sulfatee1
- Direction
- severely restrictede1
- Comparator
- pretreated with Ca 2+ or Al 3+e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The autoradiographs indicate that the permeability of the epidermal layer to sulfate is severely restricted when pretreated with K + but not when pretreated with Ca 2+ or Al 3+”
e2“excised corn ( Zea mays ) roots”
Claim · model-written summary
Pretreatment with Ca2+ or Al3+ did not restrict sulfate permeability of the epidermal layer in excised corn roots.
- Taxon
- cornZea mays subsp. mayse2
- Treatment
- pretreated with Ca 2+ or Al 3+e1
- Outcome
- permeability of the epidermal layer to sulfatee1
- Comparator
- pretreated with K +e1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The autoradiographs indicate that the permeability of the epidermal layer to sulfate is severely restricted when pretreated with K + but not when pretreated with Ca 2+ or Al 3+”
e2“excised corn ( Zea mays ) roots”
Claim · model-written summary
The restriction is apparently associated with cation exchange sites near the epidermis and results from electrostatic repulsion of anions.
- Taxon
- cornZea mays subsp. mayse2
- Outcome
- permeability of the epidermal layer to sulfatee1
- Qualifier
- electrostatic repulsive forces opposing anionse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The autoradiographs indicate that the permeability of the epidermal layer to sulfate is severely restricted when pretreated with K + but not when pretreated with Ca 2+ or Al 3+”
e2“excised corn ( Zea mays ) roots”
e3“results from the electrostatic repulsive forces opposing anions”
Claim · model-written summary
The repulsive force is hypothesised to be an inverse function of the degree of neutralization of exchange sites by adsorbed cations, in the order Al3+ > Ca2+ > K+.
- Taxon
- cornZea mays subsp. mayse2
- Treatment
- adsorbed cationse1
- Outcome
- repulsive forcee1
- Direction
- inverse functione1
- Qualifier
- Al 3+ > Ca 2+ > K +e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The repulsive force would be an inverse function of the degree neutralization of the exchange sites by adsorbed cations which is in the order Al 3+ > Ca 2+ > K +”
e2“excised corn ( Zea mays ) roots”
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